Abstract
Recent investigation on indium substituted SrFe11.9In0.1O19 has shown excellent remanence to the saturation magnetization ratio of much greater than the 0.5 that most suitable for isotropic permanent magnets. In this work, such material SrFe12-xInxO19 (x = 0; 0,05; 0,1; 0,2; and 0,5) with the highest value of remanent magnetization was modified by the co-substitution of Fe+3 in SrFe11.9In0.1O19 with Mn and Ti ions to reduce the coercivity which suitable for radar absorbing applications. A series of magnetic material with SrFe11.9-yMny/2Tiy/2In0,1O19 (y = 0,3; 0,6; 1,0 and 1,2) compositions were prepared by mechanical alloying process. The hysteresis loop for SrFe11.9-yMny/2Tiy/2In0,1O19 samples showed that the coercivity was progressively reduced from 300 kA/m for y = 0,6 to 100 kA/m for y = 1.2 with the remanence remained significantly un-changed. The reflection loss (RL) which calculated from S-parameters of vector network analyzers (VNA) has resulted in excellent absorption characteristics of SrFe11.9-yMny/2Tiy/2In0,1O19 driven by high remanent magnetization and reduced coercivity.
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